Table 4.
Effective PSII quantum efficiency (ϕPSII), electron transport rate (ETR) and steady-state chlorophyll fluorescence (Fs) in lettuce leaves treated with water (CONTROL) and glutamic acid and grown under two water regimes (well-watered: NO STRESS and water stress and re-watering: STRESS)
| Stress | Treatment | ϕPSII | ETR | Fs |
|---|---|---|---|---|
| No stress | CONTROL | 0.77 ± 0.01 | 25.9 ± 0.95 | 605.1 ± 21.0 a |
| GLUTAMIC ACID | 0.78 ± 0.01 | 25.2 ± 0.64 | 568.9 ± 11.8 ab | |
| Stress | CONTROL | 0.79 ± 0.00 | 23.2 ± 0.95 | 521.6 ± 14.7 b |
| GLUTAMIC ACID | 0.79 ± 0.00 | 26.5 ± 1.14 | 541.7 ± 8.9 b |
Measures were taken at the end of the cycle after the re-watering (12/07). Values are means ± SE (n = 15) Data were subjected to two-way ANOVA. Different letters, where present, represent significant differences (P < 0.05)